do you use a levelshifter on your crossover cable? the voltage level for
pc communication is +/-5v if i remember it correctly.
in
http://tinyos.cvs.sourceforge.net/tinyos/tinyos-2.x-contrib/ethz/snpk/tos/lib/dsn/
you can find a working tos2 implementation of a uart0 communication with
tmote.
roman
Vaibhav Nagarnaik wrote:
>
>
> Hi All,
>
> Any ideas yet why I can't communicate using UART0 from telosb?
>
> I have confirmed that the cross-over serial cable is good for communication
> and that there is no other problem. Is it something to do with using some
> kind of chip select for the multiplexed bus on UART0 and CC2420?
>
> All I have got from the archives is a solution for tinyos 1.x to use
> BusArbitration module. But I am using 2.x and I think using Resource
> interface provided by Msp430Usart0C should be enough. Is this correct?
>
> Any other people having similar troubles?
>
>
>
> Vaibhav
>
> ----- Original Message ----
> From: Kevin Klues <[EMAIL PROTECTED]>
> To: Vaibhav Nagarnaik <[EMAIL PROTECTED]>
> Cc: tinyos-help@millennium.berkeley.edu
> Sent: Thursday, October 4, 2007 3:30:15 PM
> Subject: Re: [Tinyos-help] Problem with communicating with PC using UART0 on
> telos ver.B for tinyos 2.x
>
> I'm actually surprised you see anything at all......
> You can't use USART0 to communicate with the PC because it isn't
> physically connected to the serial port on the telos -- there are no
> wires connecting USART0 to the USB controller to exchange data with
> the PC.
>
> USART0 is attached to the radio, the flash, and the external connector
> pins, while USART1 is attached to the serial port.
>
> As a side note......
> You should consider using something other than while() loops in the
> way that you do if you actually start implementing something
> substantial in TinyOS. Because of the concurrency model that TinyOS
> uses, using while() loops to wait on a flag without really knowing
> what you are doing could cause your program to lock up and never break
> out of the loop. Using a split-phase operation is preferred. Just a
> word of caution for anyone considering doing this.
>
> Kevin
>
> On 10/4/07, Vaibhav Nagarnaik <[EMAIL PROTECTED]> wrote:
>> Hi All,
>>
>> I am trying to use tinyos 2.x with telosb to communicate with PC using UART0.
>>
>> I have tried different components Msp430Usart0C and Msp430Uart0C but I don't
>> receive the same character sent from PC.
>>
>> For example if I send 'a' from PC, I get '0x58 0x08 0x01 0x00' ie four
>> characters on the PC. Even when the code explicitly sends 1 byte.
>>
>> I have set baud rate on the PC to 57600. If I run the same code using
>> Msp430Usart1C component, there is no problem.
>>
>> Can anyone please point me to the problem in this code?
>>
>> Following is the sample code I am trying to run.
>>
>> configuration TestSerialAppC {}
>> implementation {
>> components TestSerialC as App, MainC, LedsC;
>>
>> components new Msp430Usart0C() as usart0;
>>
>> App.Boot -> MainC;
>> App.Leds -> LedsC;
>>
>> App.usart -> usart0;
>> App.UsartResource -> usart0;
>> }
>>
>> module TestSerialC {
>> uses {
>> interface HplMsp430Usart as usart;
>> interface Boot;
>> interface Resource as UsartResource;
>> interface Leds;
>> }
>> }
>>
>> implementation {
>> event void Boot.booted() {
>> while (call UsartResource.request() != SUCCESS);
>> }
>> event void UsartResource.granted() {
>> uint8_t data;
>> call usart.setModeUart(&msp430_uart_default_config);
>> call usart.enableUart();
>>
>> while (1) {
>> call Leds.led1On();
>> while (! call usart.isRxIntrPending());
>> call Leds.led1Off();
>>
>> data = call usart.rx();
>> call usart.clrRxIntr();
>>
>> call Leds.led0On();
>> call usart.tx(data);
>>
>> while (! call usart.isTxEmpty());
>> if (call usart.isTxIntrPending()) {
>> call usart.clrTxIntr();
>> }
>> call Leds.led0Off();
>> }
>> }
>> }
>>
>>
>>
>> Any help is appreciated.
>>
>> Vaibhav
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> ____________________________________________________________________________________
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>
>
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